Apparatus for reducing screening to pulp.



W. N. CORNELL.

APPARATUS FOR REDUCING SCREENINGS T0 PULP.

APPLICATION FILED JUNE 2|. 1912. 1,150,099. Patented Aug. 17,1915.

3 SHEETS-SHEET l- WIT/VES'SES' INVENTOR BY L 16M, F'IAZM a? I 42 A ORNEIS W. N. CORNELL.

APPARATUSV'FOR REDUCING SGREENINGS T0 PULP.

APPLICATION FILED JUNE 21. 1912.

1,150,099. Patented Aug. 17, 1915.

3 SHEETSSHEET 2.

WITNESSES INVENTOR a A ORNEYS W. N. CORNELL.

APPARATUS FOR REDUCING SCREENINGS T0 PULP.

APPLICATION FlLED JUNE 2|. 1912.

1,150,099. Patented Aug. 17,1915.

3 SHEETS-SHEET 3.

WITNESSES INVENTOR ATTORNEYS incapable of felting.

WILLIAM N. CORNELL OF WATERTOWN, NEW YORK.

APPARATUS FOR REDUCING SCREENINGS TO PULP.

Specification of Letters Patent.

Patented Aug. 1'7, 1915.

Application filed .Tune 21, 1912. Serial No. 705,009.

To all whom it may concern Be it known that I, WILLIAM N. CORNELL, a citizen of the United States, residing at Water-town, in the county of Jefierson and State of New York, have invented certain new and useful Improvements in Apparatus for Reducing Screenings to Pulp, of which the following is a full, clear, and exact description.

In the manufacture of wood pulp, the disintegrated wood is passed through one or more screens for the purpose of separating out the bits or particles of wood which are These coarse bits or pieces constitute what is known as screenings and are usually a Waste product.

My present invention relates to the utilization of screenings, and has for its chief object to provide an eliicient apparatus for reducing the screenings to pulp by subjecting them to a combined crushing and drawing action, whereby the coarse bits or particles of wood are separated into their component fibers.

A further object is to provide an apparatus for the purpose mentioned, which shall be as simple and compact as possible consistent with the work to be done.

In carrying out my invention in the preferred manner, a plurality of sets or pairs of rolls are provided-made of sandstone or other suitable material of like nature. These rolls are mounted in adjustable bearings so as tobe capable of adjustment for the purpose of taking ufl wear. The varioussets are arranged in vertical alinement one above the other, so that the material discharged from one set will pass directly to the set next below. Between the rolls of each set is a stationary member of sandstone or similar material, having cylindro-concave surfaces to coiiperate with the rolls. Provision is also made for longitudinally oscillatingthe rolls of one or more sets relatively to the cooperating stationary concavemember. so that the bits or particles ofv wood, besides being subjected to the crushing and drawing action incident to the rotary movement of the rolls with respect to the stationary member, will be subjected to a further drawing action due to the longitudinal motion of the rolls relative to the stationary member.

This additional drawing action greatly expedites the reduction of the screenings and thus materially increases the efficiency of the machine. At the top of the apparatus, above the first rolls, is a hopper, preferably divided into two compartments, one above each of the two rolls. The material to be reduced is delivered, preferably continuously, into one compartment and passes therefrom down between the rolls and stationary members below. Falling from the last set, the partially reduced material is received by a suitable receptacle at the bottom of the machine and is pumped up to the other compartment of the hopper. From the latter the material passes through the remaining rolls and stationary members and, now fully pulped, is discharged into a second receptacle at the base of the machine, and from there is delivered by any convenient means to other apparatus for conversion into pulp-board, paper, etc.

The construction thus briefly outlined is illustrated in the annexed drawings, in which Figure 1 isa front view of the apparatus.

Fig. 2 is a side view showing the mechanism' employed for o'scillating the rolls and the devices for adjusting the rolls toward and from the cooperating eylindro-concave ele ments. Fig. 3 is a longitudinal vertical section showing the construction and arrangement of the elements which effect the reduction of the screenings. i

The various parts .of the apparatus are conveniently mounted in a framework comprising two sideframes -1, 2, connected by angle irons 3. The sandstone rolls, 4, 5, 6, 7, 8, 9 are arranged in pairs, as shown, and are journaled in bearings 10, 11, 12, 13, 14, 15, which are mounted to slideon guides or rails 16 on the cross bars 17 of the side frames. The-bearings are also connected to screw rods 18 having handwheels 19 and working in threaded apertures in the side frames, by which the bearings may be shifted on the guides or rails, thereby varying the positions of the rolls correspondingly.

Between the various sets of rolls are the cylindo-concave members 20, 21, 22. These elements are preferably made in two parts,

.as' shown, resting on the flanges of T-irons 23 and bolted thereto, the T -irons being mounted inbrackets 24 carried by the sideframes. Between members 20-21, and 21- 22, are the partitions 25, 26, each composed of two plates of flexible sheet metal connected by turnbuckles 27, 28, by which they are given an inward curvature, as shown. The partitions or guides serve to prevent the material discharged from one roll from mingling with that coming from the other of the same pair and to guide to the lower roll any material which may fall or splash upon the partition. For the purpose of preventing material from clinging to the rolls and hence being carried back between the same and the coiiperating stationary elements, suitable scrapers 29 are provided, adjustable horizontally on the angle irons 3 and bearing against the lower sides of the rolls. The scrapings fall upon inclined deflectors 30, hinged to the angle-irons and supported in adjusted position by vertically adjustable pins 31. The lower deflectors discharge into the receptacles 32, 33, hereinafter described, while the others discharge upon the rolls 5, 6,8,9.

Extending horizontally across the machine below the scrapers are spray pipes 34,

connected at one end to vertical pipes 35, 36, which are in turn connected to horizontal pipes 37, 38, to which latter pipes water under moderate pressure is supplied by a pipe 39 leading from a suitable source. The pipes 34'are perforated, as shown in Fig. 3, the perforations being located so as to throw water upon the underside of the rolls and upon the deflectors 30. The more loosely adherent particles are thus washed off the rolls before the scrapers are reached, and the scrapings on the deflectors are caused to flow off the same rapidly enough to prevent accumulation of material thereon. At the ends of the two lower sets of rolls, and resting lightly thereon, are end boards 40, 41, clamped on longitudinal members 42, 43 by means of bolts 44- passing through slots 45 in the boards. These "longitudinal members have inclined slots 46 at their ends, and extending through the slots into the side frames are bolts 47 by which the said members are secured in place. The end boards serve to kee the material from running off the rolls at the ends, and as the boards wear away they can be lowerd by letting down the supporting members 42, 43, and. adjusting the boards horizontally afterloosening the bolts 44. The hopper 48, abovethe topmost rolls, is similarly secured to similar longitudinal members 49, as shown, so as to be capable of downward adjustment as the parts in contact with the rolls wear away.

,At one side fof-fithe mach'n'e the journals jwh'ichcarry the rolls are provided with pinions 50, meshing with intermediategears 51, which are mounted in arms- 52 pivotally supported on the roll-journals in the well understood way so as to permit the necessary horizontal adjustment of the rolls with respect to the cooperating concave members. The gear train is driven by a gear 53 on a driving shaft 54, which in turn is driven by any suitable means not shown.

At the opposite side of the apparatus is a vertically extending rock shaft 56 located midway between the rolls of each pair and mounted in suitable bearings 57 carried by the side frames. Near its lower end this shaft has a laterally extending arm 58 to which the rod or link 59 is pivotally connected at one end. This rod is reciprocated by an eccentric 60 on a short vertical shaft 61. On this short shaft is a worm gear 62, engaged by a worn 63 on the adjacentjournal of one of the lower rolls. Opposite the ends of the upper rolls are two arms 64, 65, having their ends forked and embracing upper and lower trunnions or collars 66 loosely mounted in the roll-journals but incapable of longitudinal movement thereon. The trunnions of these collars are in sliding engagement with the forks of the said arms, so as to permit adjustment of the rolls with respect to the co6perating concave members as previously described, and the roll-journals are capable of axial movement in their respective bearings. From the foregoing it will be seen that as the shaft 61 is rotated by the worm and gear connection with the roll 9 the shaft 56 will be rocked, thereby oscillating'the arms 64, 65, and effecting a.

corresponding longitudinal oscillation of the rolls 4, 5. 7, 8, relative to their res ective concave elements. It will be note however, that the lower rolls 6, 9, do not partake of this axial or endwise motion, the intention being for these rolls to have more of a grinding action.

As shown in Fig. 3, the hopper 48 is divided by a partition 70 into two compart: ments 71, 72. The screenings which are to be reduced to pulp are delivered (preferably continuously) into the compartment 71, and are guided, by an inclined plate 73, carried on the partition 70, between the roll 4 and the stationary concave member 20. The combined rotary and axial motion of this roll causes the bits of yvood to be subjected to a crushing and drawing action, which separates the fibers of the bits. Passing through the next set of crushing and drawing elements and between the non-oscillating roll 6 and stationary member 22, the partially reduced material is discharged into the receptacle 32. From this receptacle the material is delivered by a pipe 74 through the agency of a suitable pump (not shown) to compartment 72, whence, guided by the inclined plate 75, it passes between roll 7 and stationary member 20. Subjected then tothe action of the remaining reducing elements, the material is finally delivered to the receptacle 33, from which it is conveyed through a pipe 76 to the point of utilization.

The apparatus herein specifically shown and described is merely the preferred embodiment of the invention, which may be embodied in various forms without departure from its proper scope as defined by the appended claims.

What I claim is:

1. In an apparatus for reducing screenings, in combination, a series of reducing sets, one above another, each comprising a pair of rotating sandstone rolls and a cooperating cylindro-concave member of sandstone between the same, mechanism for producing a relative movement of adjustment between the rolls and the respective cooperating members, means for delivering the screenings to the upper reducing set, and means for collecting the material discharged from the lower set.

2. In an apparatus for reducing screenings, in combination, a series of reducing sets, one above the other, each comprising a pair of rotating sandstone rolls and a cooperating cylindro-concave member of 'sand- 1 stone between the same, mechanism for producing a relative movement of adjustment between the rolls and the respective cooperating members, mechanism for imparting to one or more of the rolls a longitudinal oscillatory movement, means for delivering the screenings to the upper reducing set, and means for collecting the material discharged from the lower set.

3. In an apparatus for reducing screenings, in combination, a series of reducing sets, one above another, each comprising a pair of rotating sandstone rolls and a cooperating cylindro-concave member of sandstone between the same, mechanism for producing a relative movement of adjustment between the rolls and the respectivecooperating members, mechanism for imparting to one or more of the rolls a longitudinal oscillatory movement, means for delivering the screenings to the upper reducing set, and means for collecting the material discharged from the lower set,

4. In an apparatus for reducing screenings, in combination, a reducing element consisting of a rotating sandstone roll, a reducing element consisting of a cooperating cylindro-concave member of sandstone, and mechanism for imparting a longitudinal oscillatory movement to one of said elements.

5. In an apparatus for reducing screenings, in combination, a reducing element consisting of a'rotating sandstone roll, a reducing elerhent consisting of a sandstone member having a cylindro-concave surface cooperating with said roll, mechanism for imparting a'longitudinal oscillatory movement to one of said elements, means for delivering the screenings between the said elements, and means for collecting material discharged therefrom.

(3. In an apparatus for reducing screenings,, in combination, a plurality of sandstone members having opposite cylindroconcave surfaces, rotating sandstone rolls on opposite sides of said members and cooperating with the cylindro-concave surfaces thereof, means for delivering the screenings to the rolls on one side of said members, a receptacle receiving the material discharged from the last-mentioned rolls, means for delivering the material from said receptacle to the rolls on the other sideof the cylindro-concave members, and a receptacle receiving the material discharged from the last-mentioned rolls.

7. In an apparatus for reducing screenings, in combination, a pair of rotating sand stone rolls, a sandstone member between the other roll.

8. In an apparatus for reducing screenings, in combination, a plurality of'sandstone members having opposite cylindroconcave surfaces, rotating sandstone rolls on opposite sides of said members and cooperating with the cylindro-concave surfaces thereof, mechanism for-imparting a longitudinal oscillatory movement to one or more of the rolls, means for delivering the screenings to the rolls on one side 'of said members, a receptacle receiving the material discharged from the last mentioned rolls, means for delivering the material from said receptacle to the rolls on the other side of the cylindro-concave members, and a recep-' tacle receiving the material discharged from the last-mentioned rolls.

9. In an apparatus'for reducing screenings, in combination, a pair of rotating sandstone rolls, a sandstone member between the rolls having opposite cylindro-coneave surfaces cooperating with the rolls, mechanism for imparting a longitudinal oscillatory movementto the rolls, a hopper above the rolls having two compartments discharging material to the respective rolls, means for collecting the material discharged from one of the rolls, and meansfor delivering the material from said collecting means to the hopper compartment above the other roll.

10. In an apparatus for reducing screenings, in combination, a pair of spaced side frames, a pair of rotating sandstone rolls extending horizontallybetween the side frames, a sandstone member between said rolls and having opposite cylindro-concave surfaces cooperating therewith, horizontally slidable bearings for said rolls mounted on the side frames, means for shifting said bearings to shift the rolls relatively to the sandstone member, and means for imparting to the rotating rolls a longitudinal oscillatory movement.

11. In an apparatus for reducing screenings, in combination, a pair of spaced side frames, a pair of horizontal sandstone rolls having bearings mounted on the side frames, a vertically adjustable hopper bearing on the rolls and supported by the side frames, a sandstone. member between the rolls and having opposite 'cylindro-concave surfaces cooperating therewith, means for rotating the rolls, and means for imparting thereto a longitudinal oscillatory movement.

12. In an apparatus for reducing screenings, in combination, a plurality of rotating horizontally arranged sandstone rolls, one above another, a plurality of sandstone members each having a cylindro-concave surface cooperating with the respective rolls, means for rotating the rolls, a vertically extending rock shaft, and means connecting the rock-shaft with one or more of the rolls to impart thereto a longitudinal oscillatory movement.

13. In an apparatus for reducing screenings, in combination, a reducing element consisting of a rotating sandstone roll, a reducing element consisting of a sandstone member having a cylindro-concave surface cooperating with the roll, a lever connected to one-of said elements, and means for oscillating the lever to impart to the connected element a longitudinal oscillatory movement.

14. In an apparatus for reducing screenings, incombination, a plurality of reducing elements each consisting of a rotating sandstone roll, extending horizontally and arranged one above theother, a plurality of reducing elements each consisting of a cylindro-concave member of sandstone, co6perat ing with the respective rolls, a vertical rockshaft, arms extending laterally from the rock-shaft and each connected-to a reducing element, and means for rocking said shaft, whereby to impart a longitudinal oscillatory movement to the reducing elements connected to said arms.

15. In an apparatus 'for reducing screenings, in combination, a plurality of reducing sets arranged one above another, and each comprising a pair of rotating reducing elements of sandstone and a non-rotating.

sandstone element between the two rolls and cooperating therewith, a vertical rock shaft at one end of the reducing sets, arms on said rock shaft each connected to a reducing element, and means for rocking the shaft, to impart to the elements connected to the arms a longitudinal oscillatory movement.

16. In an apparatus for reducing screenings, in combination, a pair of rotating sandstone rolls, a sandstone member between the'rolls and having opposite cylindro-concave surfaces cooperating therewith, a lever pivoted adjacent to one end of the said member and having its ends connected to the rolls, and means for oscillating the lever, toimpart to the rolls a longitudinal oscillatory movement.

17. In an apparatus for reducing screenings, in combination, a plurality of reducing sets arranged one above the other and comprising rotating and non-rotating sandstone reducing elements, means for driving the rotating elements, a vertical rock shaft at one side of the reducing sets, arms fixed on the shaft and connected each to a reducing element, a vertical rotary shaft connected to one of the rotating elements so as to be rotated thereby, an actuating arm on the rock shaft, an eccentric on the rotary shaft, and a link connecting the eccentric and the actuating arm.

18. In an apparatus for reducing screenings, in combination, a plurality ofreducing sets each comprising a pair of rotating sandstone rolls and an intermediate cylindro-concave member of sandstone, said reducing sets being arranged one above another, a rock shaft extending vertically at one side of the reducing sets and located midway of the rolls, arms fixed to the roclc shaft and each connected to a roll, a rotat ing vertical shaft having an eccentric, an actuating arm on the rock shaft, and a link connecting the eccentric and the actuating arm.

19. In an apparatus for reducing screenings, in combination, a reducing element comprising a rotating sandstone roll, a reducing element comprising a sandstone member having a cylindro-concave surface cooperating with the roll, and means for im parting a longitudinal oscillatory movement to a single one.of said elements.

In testimony whereof I aifix my signature in the presence of two subscribing witnesses.

WILLIAM NI CORNELL.

Witnesses:

M. LAwsonDYnR, S. S. DUNHAM. 

